Other Comprehensive Income (Loss) (Schedule Of Tax Effects Allocated To Each Component Of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation, Net-of-Tax Amount	$ 31,729	$ (259,007)	$ (121,389)
Before- Tax Amount	16,673	(235,519)	(123,046)
Tax Benefit (Expense)	14,136	(21,189)	575
OTHER COMPREHENSIVE INCOME (LOSS)	30,809	(256,708)	(122,471)
Net unrealized gains
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Reclassification, Before Tax Amount	(1,588)	2,349	(1,646)
Before Reclassification, Tax Benefit (Expense)	674	(50)	547
Before Reclassification, Net-of-Tax Amount	(914)	2,299	(1,099)
Reclassification, Before Tax Amount	(6)	0	17
Reclassification, Tax Benefit (Expense)	0	0	0
Reclassification, Net-of-Tax Amount	(6)	0	17
Before- Tax Amount	(1,594)	2,349	(1,629)
Tax Benefit (Expense)	674	(50)	547
OTHER COMPREHENSIVE INCOME (LOSS)	(920)	2,299	(1,082)
Foreign currency translation loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Reclassification, Before Tax Amount	18,267	(263,425)	(121,417)
Before Reclassification, Tax Benefit (Expense)	13,462	(21,297)	28
Before Reclassification, Net-of-Tax Amount	31,729	(284,722)	(121,389)
Reclassification, Before Tax Amount	0	25,557	0
Reclassification, Tax Benefit (Expense)	0	158	0
Reclassification, Net-of-Tax Amount	0	25,715	0
Foreign currency translation, Before Tax Amount	18,267	(237,868)	(121,417)
Foreign currency translation, Tax Benefit (Expense)	13,462	(21,139)	28
Foreign currency translation, Net-of-Tax Amount	$ 31,729	$ (259,007)	$ (121,389)